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|1 Leaflets 4; corolla yellow; [tribe Dalbergieae]|
|1 Leaflets 5 or more (at least on the largest and best developed leaves); corolla blue, pink, or violet (except yellow in Lupinus luteus).|
|..2 Leaflets and fruits not glandular-punctate; stamens monadelphous; [tribe Genisteae]|
|..2 Leaflets and fruits glandular-punctate; stamens diadelphous; [tribe Psoraleeae].|
|....3 Leaflets linear to very narrowly oblanceolate, 0.5-2.0 (-3.5) mm wide, > 10× as long as wide; [Coastal Plain]|
|....3 Leaflets broader, > 5 mm wide, 2-4.5× as long as wide; [collectively more widespread]|